Securing America: Afghan Police Recruiting [VIDEO]

The trust between U.S. troops and Afghans is straining as NATO continues to train the country's security forces ahead of their departure in 2014. But there's growing concern over the number of Afghan forces turning on Western troops, leading the Joint Chiefs of Staff to look to change recruiting procedures.

FOX's Jennifer Griffin reports from Bagram Air Base in Afghanistan in our ongoing series on national security:

The latest aggression: An American soldier killed in southern Afghanistan by uniformed Afghan police who were supposed to be friendly. U.S. forces use an eight-step vetting process of Afghan citizens entering into the police and security forces. Chairman of the Joint Chiefs of Staff, Gen. Martin Dempsey, told FOX News the process is under increased scrutiny.

(Gen. Dempsey) "Legitimately, we oughta go back to those tribal elders and say, 'Hey, you know, you endorsed this young man, and he became an insider threat. And we need to understand what went wrong.'"